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Or it means that ICMP traffic is not working. Misconfigured networks are incredibly common. There is a massive misconception that ICMP is not needed or should b

Or it means that ICMP traffic is not working. Misconfigured networks are incredibly common. There is a massive misconception that ICMP is not needed or should be blocked for security. For example, you can google "should i open/block ICPM" and none of the stack overflow answers will tell you what's the right thing to do.

jlgaddis 9y ago
Indeed, and those who like to blindly drop all ICMP are gonna be hurting when it comes time to deploy IPv6. As noted in RFC4890 [0], "ICMPv6 is essential to the functioning of IPv6 ... Filtering strategies designed for the corresponding protocol, ICMP, in IPv4 networks are not directly applicable." So, if you currently just drop all ICMP at the edge, you might as well get used to doing it the right way now and save yourself some trouble in the future. [0]: https://www.ietf.org/rfc/rfc4890.txt https://www.ietf.org/rfc/rfc4890.txt